Ascension Island Special Issue

on .

Abundance and diversity

Abundance and Diversity

 

This month the Journal of Marine Biological Association of the United Kingdom (Volume 97, Issue 4 (Ascension Island) June 2017), has released a special Issue focussing on Ascension Island’s marine biodiversity . Twenty papers reported on the results of 202 sampling events comprising a mixture of quantitative SCUBA surveys involving belt transects for fish and mobile fauna and quadrat photography for sessile fauna. Intertidal surveys and collections and subtidal collections were also carried out. The Issue also reports on the results and findings of the RSS James Clark Ross where the seabed was mapped from 100 – 1000 m revealing a complex, diverse and variable deep-water environment.

Highlights included one new species of alga and 2 new species of Heterobranch sea slugs, many new geographical records for fish and invertebrates therefore providing a much improved baseline knowledge of the coastal marine environment and a better understanding of topical Atlantic biogeography.

A checklist of the marine benthic macroalgal flora of Ascension Island (tropical South Atlantic Ocean), based on both new collections and previous literature was produced. 82 marine macroalgae were identified, including 18 green algae, 15 brown algae and 49 red algae. Species and infraspecific taxa are reported for the first time from Ascension Island, including seven green, three brown and 28 red macroalgae, raising the total number of seaweeds recorded in Ascension so far to 112 taxa in species and infraspecific level.

 

Underwater Work

Underwater Work

 

Age and growth of tropical oysters inhabiting rocky outcrops of the tidal zone revealed that they lived longer (up to 26 years) but had slower growth in Ascension Island comparing to those of the same species that inhabit tropical regions of Southwest Asia. That was probably due to comparatively low productivity observed in the central part of the equatorial tropical Atlantic.

OystersOyster_section

Oysters and Oyster Growth

 

‘This is an incredible achievement and an exciting new step for Science in the South Atlantic, and in particular for scientific knowledge of marine species and habitats around Ascension Island. We are very proud that our collaboration, driven from the Falklands, working with scientists based on all of the South Atlantic Islands, has spear-headed this JMBA special issue. Science and research is about excellence and partnerships and in the South Atlantic I would like to think that we have both. It has been amazing to be able to work with this wonderful consortium of local, regional and international experts on this special issue’ remarked Dr Paul Brickle, SAERI Director.

Dr Paul Brewin, Director of the Shallow Marine Surveys Group based in the Falkland islands added ‘This series of expeditions has fulfilled a long-time ambition of SMSG.  Supported through our local Falkland and overseas volunteer team, we worked along-side our Ascension Island partners for the first time, in helping them address an identified urgent need for baseline, high-quality scientific marine understanding. Through this work we’ve built both strong collaborations and lasting friendships with all the team.’ 

Dr Alexander Arkhipkin of the Falkland Islands Government Fisheries Department pointed out that ‘it was an exciting opportunity to participate in joint surveys of tropical shellfish and fish faunas on Ascension Island and be able to apply our experience in marine and fisheries studies in waters much warmer than those around the Falkland Islands’. 

Director of Conservation & Fisheries for Ascension Island Government, Dr Judith Brown commented ‘The research which is detailed in this special issue, carried out with such a knowledgeable and enthusiastic group of collaborators, established marine conservation research on Ascension and has provided much needed baseline data. Marine research on Ascension is going from strength to strength, with the partnerships that were made here and continued through further funding from the UK Government, Blue Marine Foundation, the Darwin Initiative, and EU Best. These projects will provide the information needed to allow the informed designation of a large MPA in 2019 based on the scientific evidence collected.”   

Cleaner shrimp with Apollo damselfish

Cleaner shrimp with Apollo damselfish

 

Notes for editors

Funding for this work came from a grant to the Shallow Marine Surveys Group (SMSG) from the Darwin Initiative (EIDCF012). The two expeditions were organized by SMSG and the South Atlantic Environmental Research Institute (SAERI). We would like to thank the volunteer members of SMSG for excellent work in the field, and the continued support of the Falkland Island Government Fisheries Department. We would also like to thank the Ascension Island Government, the staff at the Conservation Centre particularly Nic and Sam Weber, and the Ascension Island Dive Club for their logistical support, cooperation, accommodation and hospitality. We are very grateful to British Forces South Atlantic Islands for their logistical support. Furthermore, we would like to thank the Blue Marine Foundation in association with a Darwin Initiative Grant (DPLUS021), the National Environment Research Council (NERC), BAS for enabling the very successful deep water survey around Ascension in October 2015.

Finally we are extremely grateful for the following people who participated in the coastal fieldwork for the Darwin Challenge Award: Sam Weber (Ascension Island Government), Nicola Weber (Ascension Island Government), Martin Collins (SMSG), Stephen Cartwright (SMSG), Wetjens Dimmlich (SMSG), Steve Brown (SMSG), Dion Poncet (SMSG), Juliet Hennequin (SMSG), Vladimir Laptikhovsky (SMSG), Lt Col. Simon Browning (British Forces South Atlantic Islands/SMSG), Sarah Browning (SMSG), Jerry Pierce (SMSG), Simon Morley (British Antarctic Survey), Alexander Arkhikpin (Falkland Islands Government Fisheries Department), Zhanna Shcherbich (Falkland Islands Government Fisheries Department), Peter Wirtz (Universidade do Algarve), Konstantinos Tsiamis (Hellenic Centre for Marine Research), Pieter van West (University of Aberdeen), Caz Young (Ascension Island Dive Club), and Jimmy Young (George Town, Ascension Island).